A circular coil of radius 0.100 m contains a single turn and is located in a constant magnetic field of magnitude 0.320 T. The magnetic field has the same direction as the normal to the plane of the coil. The radius increases to 0.320 m in a time of 0.0700 s.
(a) Determine the magnitude of the emf induced in the coil.
(b) The coil has a resistance of 0.620 Ω. Find the magnitude of the induced current.